Broken links in documentation

[johnheusinger]

While reviewing the Terrascan documentation, I noticed the following issues:

• In the section Ignoring Policies on a scan, there are two links and both of them aren't working.
• At the bottom of every page, there is a feedback request. After answering a question about whether the page was helpful, a broken link is displayed. The link directs to https://github.com/USERNAME/REPOSITORY/issues/new which is not a valid URL.
• There is a link in the section Argo CD Application PreSync Hooks that is working for now, but the document has permanently moved from here to here.

I submitted #86 to address these points.